ToME: the Tales of Maj'Eyal

I'm not an experienced player in ToME but made a lot in other roguelikes starting with Rogue itself.
Normal went easily for me as well as Nightmare did.
Now I'm venturing Insane, it seems to fit the difficulty if other Roguelikes quite better. Maybe I'll fail for the first time but eventually I'll do it, no doubt.

So the question for me is: which class has the best chances for madness?
Corruptor? Oozer? Fire mage?
Or maybe some hybrid adventurer build?

Aside from adventurers, the only 2 madness winners have been Berserker and Marauder, presumably because of Unstoppable.